CN210296506U - Z-shaped fuel cell flow field plate - Google Patents
Z-shaped fuel cell flow field plate Download PDFInfo
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- CN210296506U CN210296506U CN201920994975.9U CN201920994975U CN210296506U CN 210296506 U CN210296506 U CN 210296506U CN 201920994975 U CN201920994975 U CN 201920994975U CN 210296506 U CN210296506 U CN 210296506U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
A zigzag-shaped fuel cell flow field plate comprising: water-air flow field plates and hydrogen flow field plates; the water-air flow field plate comprises an air inlet channel, an air outlet channel, a cooling liquid inlet channel and a cooling liquid outlet channel; the hydrogen flow field plate comprises a hydrogen inlet channel and a hydrogen outlet channel; one side of the water-air flow field plate is provided with a coolant flow channel, a coolant flow guide groove and an air flow guide groove, the other side of the water-air flow field plate is provided with an air flow channel, one side of the hydrogen flow field plate is provided with a hydrogen flow channel, and the other side of the hydrogen flow field plate is provided with a hydrogen flow guide groove. The inlet and outlet of the gas are positioned on two sides of the flow field plate, and the flow channel between the inlet and the outlet is Z-shaped, so that the flow resistance of the Z-shaped flow channel structure is small, and the cost of matching a cooling pump and an air compressor can be reduced.
Description
Technical Field
The utility model discloses a belong to the fuel cell field, concretely relates to fuel cell flow field board of zigzag.
Background
The flow field is a groove of various shapes machined on the bipolar plate to provide access for reactants and reaction products. The flow field design requirements are as follows: (1) the basic principle of flow field design is to ensure that sufficient reactants can be obtained at all parts of the electrode under the condition of certain reaction and supply quantity; (2) according to the conductive characteristics of the electrode and the bipolar plate material, the area of the smooth groove has an optimal value; (3) the flowing state of the reactant in the flow field, which is determined by the flow field structure, is favorable for the transfer of the reactant to the reaction electricity of the catalytic layer through the electrode diffusion layer and can promote the smooth discharge of reaction products; (4) at a given flow rate, the pressure drop of the reactants across the flow field is moderate.
Therefore, in the flow field design process, sufficient reactants can be obtained at all parts of the electrode under the condition of certain reaction and supply quantity; the aperture ratio (the ratio of the groove area to the total electrode area) of the bipolar plate should be an optimal value, and should be between 40% and 75%; at a given flow rate, the pressure drop of the reactants across the flow field is moderate.
The conductivity and flow resistance of the existing flow field plate are difficult to meet the requirements under the condition of ensuring sufficient reaction quantity.
SUMMERY OF THE UTILITY MODEL
The technical solution problem of the utility model is that: the defects of the prior art are overcome, the Z-shaped flow field plate for the fuel cell is provided, and the defects of conductivity and flow resistance of the flow field plate under the condition of meeting the requirement of sufficient reaction quantity are solved.
The technical solution of the utility model is that:
a zigzag-shaped fuel cell flow field plate comprising: a water-air flow field plate (7) and a hydrogen flow field plate (8);
the water-air flow field plate (7) comprises an air inlet channel (1), an air exhaust channel (2), a cooling liquid inlet channel (5) and a cooling liquid exhaust channel (6); the hydrogen flow field plate (8) comprises a hydrogen inlet channel (3) and a hydrogen outlet channel (4);
one side of the water-air flow field plate (7) is provided with a cooling liquid flow channel, a cooling liquid diversion trench and an air diversion trench, the other side is provided with an air flow channel, one side of the hydrogen flow field plate (8) is a hydrogen flow channel, and the other side is provided with a hydrogen diversion trench;
the cooling liquid flows in from the cooling liquid inlet channel (5), sequentially passes through the cooling liquid diversion groove, the cooling liquid flow channel and the cooling liquid diversion groove, and then flows out from the cooling liquid discharge channel (6);
air flows in from the air inlet channel (1), sequentially passes through the air diversion groove, the air flow channel and the air diversion groove, and then flows out from the air exhaust channel (2);
the hydrogen flows in from the hydrogen inlet channel (3), sequentially passes through the hydrogen guide groove, the hydrogen flow channel and the hydrogen guide groove, and then flows out from the hydrogen exhaust channel (4).
The cooling liquid diversion trench, the cooling liquid flowing channel, the cooling liquid inlet channel (5) and the cooling liquid outlet channel (6) are positioned on the same side of the water-air flow field plate (7).
The air inlet channel (1), the air outlet channel (2) and the air guide groove are positioned on the same side of the water-air flow field plate (7), and the air flow channel is positioned on the other side.
The hydrogen inlet channel (3), the hydrogen exhaust channel (4) and the hydrogen guide groove are positioned on the same side of the hydrogen flow field plate (8), and the hydrogen flow channel is positioned on the other side.
The air inlet channel (1) and the air exhaust channel (2) are distributed at the left edge and the right edge of the water-air flow field plate (7), and the cooling liquid inlet channel (5) and the cooling liquid exhaust channel (6) are distributed at the upper edge and the lower edge of the water-air flow field plate (7); the hydrogen inlet channel (3) and the hydrogen outlet channel (4) are distributed on the left edge and the right edge of the hydrogen flow field plate (8).
The cooling liquid flow channel is a straight flow channel.
The air flow passage and the hydrogen flow passage are both zigzag flow passages.
The air flow channel comprises an air inlet section, an air outlet section and a transition section for connecting the air inlet section and the air outlet section, wherein the air inlet section, the air outlet section and the transition section form an included angle of 90 degrees, the joints of the transition section, the air inlet section and the air outlet section are respectively provided with a chamfer, the cross section of the air flow channel is rectangular, the depth of the air flow channel is 0.3-0.5mm, the width of the air flow channel is 0.8-1.5mm, the ridge width between adjacent air flow channels is 0.5-1mm, and the radius of the circular arc of each chamfer is 0.5-1 mm;
the maximum length of the air inlet section is 160-140mm, the minimum length is 0.8-2mm, the maximum length and the minimum length are uniformly changed, the length of the air inlet section is in primary negative correlation with the sequence of the flow channels, and the slope of the air inlet section is-1; the length of the transition section is constant and is 80-85mm, the minimum length of the exhaust section is 0.8-2mm, the maximum length of the exhaust section is 130-150mm, the minimum length and the maximum length are uniformly changed, the length of the exhaust section and the sequence of the flow passage form a positive correlation, and the slope of the exhaust section is 1; and the exhaust sections correspond to the intake sections in the sequence from small to large one by one.
The hydrogen flow channel comprises an air inlet section, an air outlet section and a transition section for connecting the air inlet section and the air outlet section, wherein the air inlet section, the air outlet section and the transition section form an included angle of 90 degrees, and chamfers are arranged at the joints of the transition section, the air inlet section and the air outlet section, the cross section of the hydrogen flow channel is rectangular, the depth of the hydrogen flow channel is 0.4-0.7mm, the width of the hydrogen flow channel is 1-1.5mm, the ridge width between adjacent hydrogen flow channels is 0.8-1.2mm, and the radius of the circular arc of each chamfer is 0.5-1 mm;
the maximum length of the air inlet section is 130-140mm, the minimum length is 1.5-2mm, the maximum length and the minimum length are uniformly changed, the length of the air inlet section is in one-time positive correlation with the flow channel sequence, the slope of the air inlet section is 0.99, the length of the transition section is uniformly changed and is 120-140mm, the length of the transition section is in one-time positive correlation with the flow channel sequence, and the slope of the transition section is 0.73; the minimum length of the exhaust section is 0.5-1mm, the maximum length is 120-140mm, the minimum length and the maximum length are uniformly changed, the length of the exhaust section is in positive correlation with the sequence of the flow channels once, and the slope is-1.
The material of the water-air flow field plate and the hydrogen flow field plate is a graphite plate.
Compared with the prior art, the utility model beneficial effect be:
(1) the width of the flow channel is reasonably designed, and the proton exchange membrane is sufficiently supported on the premise of fully contacting with the flow channel ridge, so that the contact resistance is reduced, and the reaction area is increased;
(2) the depth of the flow channel is reasonable in design, and the flow resistance requirement is met on the premise that the flow field plate is thin enough.
(3) The result of the comprehensive final test proves that the flow channel shapes of the air flow channel and the hydrogen flow channel are reasonably designed.
Drawings
FIG. 1 is a cross-sectional view of a water-air plate air side flow channel of a fuel cell flow field plate of the present invention;
FIG. 2 is a water side flow channel of a Z-shaped fuel cell flow field plate of the present invention;
fig. 3 is a hydrogen plate hydrogen flow channel of a zigzag fuel cell flow field plate of the present invention;
fig. 4 is a schematic diagram of the performance test performed on the 50-piece electric pile of the present invention.
Detailed Description
The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
As shown in fig. 1, the present invention provides a zigzag flow field plate for a fuel cell, comprising: a water-air flow field plate 7 and a hydrogen flow field plate 8; as shown in fig. 1 and 2, the air flow field plate has air flow channels and coolant flow channels on its two sides, and as shown in fig. 3, it is a hydrogen flow field plate.
The water-air flow field plate 7 comprises an air inlet channel 1, an air exhaust channel 2, a cooling liquid inlet channel 5 and a cooling liquid exhaust channel 6; the hydrogen flow field plate 8 comprises hydrogen inlet channels 3 and hydrogen outlet channels 4;
one side of the water-air flow field plate 7 is provided with a coolant flow channel, a coolant flow guide groove and an air flow guide groove, the other side is provided with an air flow channel, one side of the hydrogen flow field plate 8 is a hydrogen flow channel, and the other side is provided with a hydrogen flow guide groove;
the cooling liquid flows in from the cooling liquid inlet channel 5, sequentially passes through the cooling liquid diversion groove, the cooling liquid flowing channel and the cooling liquid diversion groove, and then flows out from the cooling liquid outlet channel 6;
air flows in from the air inlet channel 1, sequentially passes through the air guide groove, the air flow channel and the air guide groove, and then flows out from the air exhaust channel 2;
the hydrogen flows in from the hydrogen inlet channel 3, sequentially passes through the hydrogen guide groove, the hydrogen flow channel and the hydrogen guide groove, and then flows out from the hydrogen exhaust channel 4.
The cooling liquid diversion grooves, the cooling liquid flowing channels, the cooling liquid inlet channels 5 and the cooling liquid outlet channels 6 are positioned on the same side of the water-air flow field plate 7.
The air inlet channel 1, the air outlet channel 2 and the air guide groove are positioned on the same side of the water-air flow field plate 7, and the air flow channel is positioned on the other side.
The hydrogen inlet channels 3, the hydrogen outlet channels 4 and the hydrogen guide grooves are positioned on the same side of the hydrogen flow field plate 8, and the hydrogen flow channels are positioned on the other side.
The air inlet channel 1 and the air exhaust channel 2 are distributed at the left edge and the right edge of the water-air flow field plate 7, and the cooling liquid inlet channel 5 and the cooling liquid exhaust channel 6 are distributed at the upper edge and the lower edge of the water-air flow field plate 7; the hydrogen inlet channels 3 and the hydrogen outlet channels 4 are distributed on the left edge and the right edge of the hydrogen flow field plate 8.
The cooling liquid flow channel is a straight flow channel. The air flow passage and the hydrogen flow passage are both zigzag flow passages. Too large a channel width will increase the MEA area within the channel without adequate mechanical support; if the width of the channel is small, the reaction gas cannot obtain more contact area of the MEA; the increase in channel depth reduces the pressure drop in the channel, which increases the thickness of the plate and is not conducive to increasing the volume and mass power density; if the depth of the channel is too small, the carbon paper of the MEA may block the channel, so that the reaction gas may not flow smoothly; reducing the land width between the channels promotes the discharge of gas and water from the MEA sections below the lands, but as the land width is reduced, the contact resistance within the cell increases, which is also not conducive to improved cell performance.
The short circuit of gas inside the flow field refers to a phenomenon in which gas flows through the diffusion layer at the bottom of the shoulder of the flow field without flowing along the channel of the flow field. The gas short circuit occurs because of the pressure difference between adjacent channels, which is more likely to occur when the gas velocity is higher. The result of the short circuit is that the gas flow rate is reduced, so that liquid water drops accumulated in the channel cannot be effectively discharged, thereby increasing the flow resistance and aggravating the gas short circuit phenomenon, which is a vicious circle process.
When the flow field is designed, the possibility of gas short circuit can be reduced by increasing the width of the shoulder at the corner of the serpentine flow field, reducing the flow resistance and gas velocity of gas in the channel, increasing the capability of the bottom of the shoulder for preventing the gas from passing through (increasing the pressing force or adopting carbon paper with low porosity and the like), and adopting the corner of the serpentine flow field to adopt a fillet method and the like.
An optimized flow field configuration should take into account the maximum contact area of the flow field with the MEA while providing sufficient reactant gas for the electrochemical reaction. Generally, the densified channels and lands are advantageous for mechanical support of the MEA because the densified flow field reduces the span of land support. While the wide shoulder can improve electrical and thermal conductivity, it increases the channel spacing, reduces the contact area of the MEA with the reactant gases, and increases the accumulation of water in this portion of the gas diffusion electrode.
The air flow channel comprises an air inlet section, an air outlet section and a transition section for connecting the air inlet section and the air outlet section, wherein the air inlet section, the air outlet section and the transition section form an included angle of 90 degrees, the joints of the transition section, the air inlet section and the air outlet section are respectively provided with a chamfer, the cross section of the air flow channel is rectangular, the depth of the air flow channel is 0.3-0.5mm, the width of the air flow channel is 0.8-1.5mm, the ridge width between adjacent air flow channels is 0.5-1mm, and the radius of the circular arc of each chamfer is 0.5-1 mm;
the maximum length of the air inlet section is 160-140mm, the minimum length is 0.8-2mm, the maximum length and the minimum length are uniformly changed, the length of the air inlet section is in primary negative correlation with the sequence of the flow channels, and the slope of the air inlet section is-1; the length of the transition section is constant and is 80-85mm, the minimum length of the exhaust section is 0.8-2mm, the maximum length of the exhaust section is 130-150mm, the minimum length and the maximum length are uniformly changed, the length of the exhaust section and the sequence of the flow passage form a positive correlation, and the slope of the exhaust section is 1; and the exhaust sections correspond to the intake sections in the sequence from small to large one by one.
The hydrogen flow channel comprises an air inlet section, an air outlet section and a transition section for connecting the air inlet section and the air outlet section, wherein the air inlet section, the air outlet section and the transition section form an included angle of 90 degrees, and chamfers are arranged at the joints of the transition section, the air inlet section and the air outlet section, the cross section of the hydrogen flow channel is rectangular, the depth of the hydrogen flow channel is 0.4-0.7mm, the width of the hydrogen flow channel is 1-1.5mm, the ridge width between adjacent hydrogen flow channels is 0.8-1.2mm, and the radius of the circular arc of each chamfer is 0.5-1 mm;
the maximum length of the air inlet section is 130-140mm, the minimum length is 1.5-2mm, the maximum length and the minimum length are uniformly changed, the length of the air inlet section is in one-time positive correlation with the flow channel sequence, the slope of the air inlet section is 0.99, the length of the transition section is uniformly changed and is 120-140mm, the length of the transition section is in one-time positive correlation with the flow channel sequence, and the slope of the transition section is 0.73; the minimum length of the exhaust section is 0.5-1mm, the maximum length is 120-140mm, the minimum length and the maximum length are uniformly changed, the length of the exhaust section is in one negative correlation with the sequence of the flow channels, and the slope of the exhaust section is-1.
The utility model discloses the pile to 50 pieces of constitution has carried out performance test, and performance test is good, and rated power surpasss theoretical calculation numerical value 8kW, reaches 10 kW. As shown in fig. 4, the voltage value of 50 single cells at 330A is shown, and each single cell is stable.
The details of the present invention not described in detail in the specification are well known in the art.
Claims (10)
1. A zigzag-shaped flow field plate for a fuel cell, comprising: a water-air flow field plate (7) and a hydrogen flow field plate (8);
the water-air flow field plate (7) comprises an air inlet channel (1), an air exhaust channel (2), a cooling liquid inlet channel (5) and a cooling liquid exhaust channel (6); the hydrogen flow field plate (8) comprises a hydrogen inlet channel (3) and a hydrogen outlet channel (4);
one side of the water-air flow field plate (7) is provided with a cooling liquid flow channel, a cooling liquid diversion trench and an air diversion trench, the other side is provided with an air flow channel, one side of the hydrogen flow field plate (8) is a hydrogen flow channel, and the other side is provided with a hydrogen diversion trench;
the cooling liquid flows in from the cooling liquid inlet channel (5), sequentially passes through the cooling liquid diversion groove, the cooling liquid flow channel and the cooling liquid diversion groove, and then flows out from the cooling liquid discharge channel (6);
air flows in from the air inlet channel (1), sequentially passes through the air diversion groove, the air flow channel and the air diversion groove, and then flows out from the air exhaust channel (2);
the hydrogen flows in from the hydrogen inlet channel (3), sequentially passes through the hydrogen guide groove, the hydrogen flow channel and the hydrogen guide groove, and then flows out from the hydrogen exhaust channel (4).
2. A zigzag-shaped fuel cell flow field plate as claimed in claim 1, wherein: the cooling liquid diversion trench, the cooling liquid flowing channel, the cooling liquid inlet channel (5) and the cooling liquid outlet channel (6) are positioned on the same side of the water-air flow field plate (7).
3. A zigzag-shaped fuel cell flow field plate as claimed in claim 1, wherein: the air inlet channel (1), the air outlet channel (2) and the air guide groove are positioned on the same side of the water-air flow field plate (7), and the air flow channel is positioned on the other side.
4. A zigzag-shaped fuel cell flow field plate as claimed in claim 1, wherein: the hydrogen inlet channel (3), the hydrogen exhaust channel (4) and the hydrogen guide groove are positioned on the same side of the hydrogen flow field plate (8), and the hydrogen flow channel is positioned on the other side.
5. A zigzag-shaped fuel cell flow field plate as claimed in claim 1, wherein: the air inlet channel (1) and the air exhaust channel (2) are distributed at the left edge and the right edge of the water-air flow field plate (7), and the cooling liquid inlet channel (5) and the cooling liquid exhaust channel (6) are distributed at the upper edge and the lower edge of the water-air flow field plate (7); the hydrogen inlet channel (3) and the hydrogen outlet channel (4) are distributed on the left edge and the right edge of the hydrogen flow field plate (8).
6. A zigzag-shaped fuel cell flow field plate as claimed in claim 1, wherein: the cooling liquid flow channel is a straight flow channel.
7. A zigzag-shaped fuel cell flow field plate as claimed in claim 1, wherein: the air flow passage and the hydrogen flow passage are both zigzag flow passages.
8. A zigzag fuel cell flow field plate as claimed in claim 7, wherein: the air flow channel comprises an air inlet section, an air outlet section and a transition section for connecting the air inlet section and the air outlet section, wherein the air inlet section, the air outlet section and the transition section form an included angle of 90 degrees, the joints of the transition section, the air inlet section and the air outlet section are respectively provided with a chamfer, the cross section of the air flow channel is rectangular, the depth of the air flow channel is 0.3-0.5mm, the width of the air flow channel is 0.8-1.5mm, the ridge width between adjacent air flow channels is 0.5-1mm, and the radius of the circular arc of each chamfer is 0.5-1 mm;
the maximum length of the air inlet section is 160-140mm, the minimum length is 0.8-2mm, the maximum length and the minimum length are uniformly changed, the length of the air inlet section is in primary negative correlation with the sequence of the flow channels, and the slope of the air inlet section is-1; the length of the transition section is constant and is 80-85mm, the minimum length of the exhaust section is 0.8-2mm, the maximum length of the exhaust section is 130-150mm, the minimum length and the maximum length are uniformly changed, the length of the exhaust section and the sequence of the flow passage form a positive correlation, and the slope of the exhaust section is 1; and the exhaust sections correspond to the intake sections in the sequence from small to large one by one.
9. A zigzag fuel cell flow field plate as claimed in claim 7, wherein: the hydrogen flow channel comprises an air inlet section, an air outlet section and a transition section for connecting the air inlet section and the air outlet section, wherein the air inlet section, the air outlet section and the transition section form an included angle of 90 degrees, and chamfers are arranged at the joints of the transition section, the air inlet section and the air outlet section, the cross section of the hydrogen flow channel is rectangular, the depth of the hydrogen flow channel is 0.4-0.7mm, the width of the hydrogen flow channel is 1-1.5mm, the ridge width between adjacent hydrogen flow channels is 0.8-1.2mm, and the radius of the circular arc of each chamfer is 0.5-1 mm;
the maximum length of the air inlet section is 130-140mm, the minimum length is 1.5-2mm, the maximum length and the minimum length are uniformly changed, the length of the air inlet section is in one-time positive correlation with the flow channel sequence, the slope of the air inlet section is 0.99, the length of the transition section is uniformly changed and is 120-140mm, the length of the transition section is in one-time positive correlation with the flow channel sequence, and the slope of the transition section is 0.73; the minimum length of the exhaust section is 0.5-1mm, the maximum length is 120-140mm, the minimum length and the maximum length are uniformly changed, the length of the exhaust section is in one negative correlation with the sequence of the flow channels, and the slope of the exhaust section is-1.
10. A zigzag-shaped fuel cell flow field plate as claimed in claim 1, wherein: the water-air flow field plate (7) and the hydrogen flow field plate (8) are made of graphite plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920994975.9U CN210296506U (en) | 2019-06-28 | 2019-06-28 | Z-shaped fuel cell flow field plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920994975.9U CN210296506U (en) | 2019-06-28 | 2019-06-28 | Z-shaped fuel cell flow field plate |
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| CN210296506U true CN210296506U (en) | 2020-04-10 |
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| CN201920994975.9U Active CN210296506U (en) | 2019-06-28 | 2019-06-28 | Z-shaped fuel cell flow field plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289431A (en) * | 2019-06-28 | 2019-09-27 | 北京航天石化技术装备工程有限公司 | A kind of fuel cell flow field board of zigzag |
| CN113381038A (en) * | 2021-05-27 | 2021-09-10 | 东风汽车集团股份有限公司 | Metal bipolar plate with Z-shaped flow field area distribution |
-
2019
- 2019-06-28 CN CN201920994975.9U patent/CN210296506U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289431A (en) * | 2019-06-28 | 2019-09-27 | 北京航天石化技术装备工程有限公司 | A kind of fuel cell flow field board of zigzag |
| CN113381038A (en) * | 2021-05-27 | 2021-09-10 | 东风汽车集团股份有限公司 | Metal bipolar plate with Z-shaped flow field area distribution |
| CN113381038B (en) * | 2021-05-27 | 2022-11-29 | 东风汽车集团股份有限公司 | Metal bipolar plate with Z-shaped flow field area distribution |
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